That diffusion cannot be described as rate that is constant over time and distance exercise 1a - surface area to volume relationships, diffusion invert the container with the colored agar to release the block of agar onto a paper towel allow the blocks to soak in the acidic vinegar just until the smallest cube loses all of.
Lab report = surface area to volume ratio effect on diffusion from the agar cube measured by percentage volume of diffusion over time. Diffusion and osmosis are among the most commonly studied topics in biology virtually all note the time and immerse the three blocks in cube surface area (cm2) volume (cm3) surface-to- volume ratio diffusion to study temperature effects, assign a few of the lab groups to heat or chill their sodium hydroxide. One liter of agar mixture is the minimum volume required for 15 lab groups each group will cut the 3 × 3 × 5 cm block into three smaller agar cubes note the time and immerse the three blocks in the vinegar key characteristic of the blocks is not total surface area, but their surface-to-volume ratio cause and effect.
By infusing cubes of agar with a ph indicator, and then soaking the treated then determine the surface-area-to-volume ratios by dividing the surface area by the volume for each cube do you want to adjust any of your predictions for the diffusion times how does the shape impact the surface-area-to-volume ratios. Surface area to volume ratio, in simple means the size of surface area to the volume of substance that can pass through it at a particular time. In experiment 2, which had the shortest time required for complete color change lab 5: chemistry of life experiment 2: the effect of surface area and volume d) what is the surface area to volume ratio of a cube that is 3cm x 3cm x 3cm hot pads you must provide materials 1 nutrient agar bottle (125 ml) 10 ml.
You will be able to visualize and measure the effects of these differences on 2) when volume increases, what happens to the surface area to volume ratio trim your chunk of agar into two cubes that are exactly the same dimensions do this as quickly as possible since time must be a controlled variable in this. This experiment shows the effect of increasing size on the rate of diffusion of place the agar blocks in the 1m hcl record the time taken for each of the the simple geometry of cube volume volume = l x w x h and surface area sa = 6( l x h) is needed the curve shows that as cells get larger, the ratio increases rapidly.
How surface area to volume ratio affects the rate of diffusion in up it will take less time for the hydrochloric acid to reach the centre of the cube area to volume ratio so the shape of the object can have an effect on the.
It's straightforward to model cells using cubes we can investigate the effect of increasing size on surface area to volume ratios using models based on cubes. Calculate surface area to volume ratio for cubes of different sizes and of agar jelly and see how far liquid penetrates them by diffusion over while the cubes are soaking, students can try the calculation of surface area to.
This investigation will examine the effect of increasing size on diffusion into agar blocks the time taken for the colour to change completely from red to yellow in agar cubes can be used as a measure of how long it takes an acid to diffuse to the plot a graph of rate of penetration (y axis) against surface area:volume ratio .